George I of Greece King of Greece (r. 1863–1913) (1845–1913) Parents Louise of Hesse-Kassel Christian IX of Denmark Children Prince Andrew of Greece and Denmark Princess Alexandra of Greece and Denmark Prince Christopher of Greece and Denmark Prince Nicholas of Greece and Denmark Prince George of Greece and Denmark Constantine I of Greece Princess Olga of Greece and Denmark Princess Maria of Greece and Denmark Siblings Frederik VIII of Denmark Alexandra of Denmark Thyra, Crown Princess of Hanover Maria Feodorovna (Dagmar of Denmark) Prince Valdemar of Denmark Partners Olga Constantinovna of Russia
